First, try running Repair/Optimize in the Admin CP. You may need to run it more than once to fix all errors:
Admin CP -> Maintenance -> Repair/Optimize Tables -> Check All -> Continue
OR:
it seems the table undermu1_negrow.contenttype doesn't exist , try to DROP TABLE IF EXISTS and then recreate it , You can get its structure from the mysql-schema.php file inside the install folder.
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